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Colloidal Cobalt Phosphide Nanocrystals as Trifunctional Electrocatalysts for Overall Water Splitting Powered by a Zinc–Air Battery
Advanced Materials ( IF 29.4 ) Pub Date : 2018-01-15 , DOI: 10.1002/adma.201705796
Hui Li 1 , Qi Li 2 , Peng Wen 3 , Trey B. Williams 1 , Shiba Adhikari 4 , Chaochao Dun 5 , Chang Lu 1 , Dominique Itanze 1 , Lin Jiang 6 , David L. Carroll 5 , George L. Donati 1 , Pamela M. Lundin 7 , Yejun Qiu 3 , Scott M. Geyer 1
Affiliation  

Highly efficient and stable electrocatalysts, particularly those that are capable of multifunctionality in the same electrolyte, are in high demand for the hydrogen evolution reaction (HER), oxygen evolution reaction (OER), and oxygen reduction reaction (ORR). In this work, highly monodisperse CoP and Co2P nanocrystals (NCs) are synthesized using a robust solution‐phase method. The highly exposed (211) crystal plane and abundant surface phosphide atoms make the CoP NCs efficient catalysts toward ORR and HER, while metal‐rich Co2P NCs show higher OER performance owing to easier formation of plentiful Co2P@COOH heterojunctions. Density functional theory calculation results indicate that the desorption of OH* from cobalt sites is the rate‐limiting step for both CoP and Co2P in ORR and that the high content of phosphide can lower the reaction barrier. A water electrolyzer constructed with a CoP NC cathode and a Co2P NC anode can achieve a current density of 10 mA cm−2 at 1.56 V, comparable even to the noble metal‐based Pt/C and RuO2/C pair. Furthermore, the CoP NCs are employed as an air cathode in a primary zinc–air battery, exhibiting a high power density of 62 mW cm−2 and good stability.

中文翻译:

胶状磷化钴纳米晶体作为三功能电催化剂,用于锌-空气电池供电的总水分解

高效且稳定的电催化剂,特别是那些能够在同一电解质中具有多种功能的电催化剂,对氢气析出反应(HER),氧气析出反应(OER)和氧气还原反应(ORR)的需求很高。在这项工作中,使用稳固的溶液相方法合成了高度单分散的CoP和Co 2 P纳米晶体(NC)。高度暴露的(211)晶面和丰富的表面磷原子使CoP NCs成为ORR和HER的有效催化剂,而金属含量较高的Co 2 P NCs由于形成大量Co 2较容易而显示出较高的OER性能。P @ COOH异质结。密度泛函理论计算结果表明,钴位置的OH *脱附是ORR中CoP和Co 2 P的限速步骤,并且高含量的磷化物可降低反应势垒。由CoP NC阴极和Co 2 P NC阳极构成的水电解槽在1.56 V时可达到10 mA cm -2的电流密度,甚至可与基于贵金属的Pt / C和RuO 2 / C对媲美。此外,CoP NCs在一次锌-空气电池中用作空气阴极,具有62 mW cm -2的高功率密度和良好的稳定性。
更新日期:2018-01-15
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